Printers, the Cloud & Microsoft 365 (Plain‑English)
Microsoft 365 made sign‑ins safer (short‑lived tokens, MFA, Conditional Access). Most printers didn’t. That mismatch is why ‘scan to OneDrive/SharePoint’ feels harder than it should be. Also, staying online isn’t the same as having a backup—disaster‑recovery copies keep the current state, not historical versions, so you still need point‑in‑time restores. [1][4]
Why this keeps breaking (even when “nothing changed”)
Microsoft 365 authenticates users and apps with modern sign‑in (OAuth 2.0/OpenID Connect), often with MFA and Conditional Access policies. This is safer and more controllable than passwords stored on devices. [1]
Printers, on the other hand, were built for a world of trusted office networks and saved credentials. They struggle with interactive prompts and token handling. So walk‑up scanning may work for months and then suddenly fail after a tenant security change—until a firmware or connector update catches up.
Availability is not backup (and that matters here)
Microsoft keeps services available by replicating data across datacenters—great for uptime. But if a file is deleted or encrypted by ransomware, that ‘bad’ change can be replicated, too. Microsoft notes that a disaster‑recovery copy preserves the current state, not historical points in time; you still need point‑in‑time backup to recover at scale. [4]
Why “scan to email” and “scan to SharePoint” often fail
1) Old sign‑in methods are going away. Many devices relied on Basic authentication (username/password) to send email or access resources. Microsoft disabled Basic auth for most Exchange Online protocols in 2022 because it can’t enforce MFA and is frequently abused; organizations are encouraged to block legacy auth. [2][3]
2) Printers struggle with modern identity. Modern auth uses short‑lived tokens that must be securely stored and refreshed. Some devices handle this well; others require periodic re‑authorization because the token flow isn’t fully supported.
3) Vendor connectors add moving parts. Manufacturers often ship apps/connectors for SharePoint/OneDrive to bridge the gap. They work—until a security default changes and the connector needs an update.
A day‑in‑the‑life example
Accounting scans invoices to a SharePoint library. It’s smooth for months. Then scanning fails after a new Conditional Access rule or an identity/security change. The panel shows a generic sign‑in error; employees start emailing PDFs around. A few weeks later, a firmware or connector update arrives and scanning works again—until the next policy shift.
What actually changed? Microsoft 365 applied a stronger sign‑in requirement (e.g., MFA, device health, sign‑in frequency). The printer couldn’t satisfy it. A connector or firmware update re‑aligned the device with the modern flow. [1]
The common “quick fixes” (and why they backfire)
• Turning off MFA or allowing legacy auth for a mailbox ‘just for scanning’ weakens your tenant and re‑opens the most abused attack paths. Microsoft recommends blocking legacy authentication because most password‑spray and credential‑stuffing attacks target those protocols. [3]
• App passwords/shared mailboxes rely on legacy behaviors that clash with modern security defaults. As Microsoft retires older protocols, these shortcuts break more often. [2]
• Unmanaged SMTP relays and odd workarounds may help short‑term, but you’re fighting the direction of the platform and will revisit the problem later.
The better way (keeps security high and people moving)
1) Treat printers as exceptions (Zero Trust mindset). Printers aren’t cloud‑native. Accept that—and limit what they can reach. Give the minimum access needed, isolate them where practical, and avoid broad write access to sensitive libraries. [3]
2) Standardize one supported method per use case. For scan‑to‑email, use a modern‑auth approach where supported (OAuth for SMTP AUTH) or move to Microsoft‑approved alternatives as Basic auth disappears. For scan‑to‑SharePoint/OneDrive, prefer the manufacturer’s Microsoft 365 app/connector that supports modern sign‑in. [2][5]
3) Let the cloud do the heavy lifting. Instead of pushing the printer to write directly into a sensitive library, scan to a simple ‘drop‑off’ (mailbox or neutral folder). Then let Power Automate file, tag, and route documents. The identity and compliance complexity lives in the cloud—where it belongs. [1]
4) Block legacy authentication (on purpose). Turn on policies that block legacy auth (or security defaults). Cutting off legacy protocols reduces common attack vectors and removes the temptation to create ‘temporary’ exceptions that become permanent. [3]
5) Back up Microsoft 365—and test restores. Redundancy isn’t backup. Ensure you can restore OneDrive, SharePoint, and Exchange to specific points in time. Microsoft’s M365 Backup FAQ notes DR preserves current state; backups provide the point‑in‑time restore you need after large incidents. Test quarterly. [4]
Good / Better / Best (pick what fits your team)
• Good: Scan to a shared inbox or neutral folder; someone files things daily.
• Better: Use the printer vendor’s Microsoft 365 app with modern sign‑in; users choose destination libraries at the panel.
• Best: Scan to a drop‑off; Power Automate auto‑routes based on rules (department, keywords, barcodes). Keep the device simple and push the logic into the cloud. [1]
Quick checklist
• List every ‘scan to cloud’ path and how it signs in today.
• Pick one standard for scan‑to‑email and one for scan‑to‑SharePoint/OneDrive; document it.
• Enable a policy to block legacy auth (or security defaults). [3]
• Check device firmware/connector versions, schedule quarterly reviews.
• Verify you can restore from backup for OneDrive, SharePoint, and Exchange. [4]
For Omaha decision‑makers
If your teams are emailing PDFs because scanning keeps failing, it’s not a people problem—it’s a workflow and identity problem. You don’t need to loosen security to make printers happy. You need a simple, standard, cloud‑led flow that devices can follow without exceptions.
Based in Omaha? Infinite Technologies USA will review your Microsoft 365 setup, map your printer workflows, and design a plain‑English, low‑friction plan—with documented runbooks and a testable recovery path. Book a free Data Protection & Workflow Assessment.
Sources
[1] Microsoft Entra ID — OAuth 2.0 / Modern Authentication overview — https://learn.microsoft.com/en-us/entra/architecture/auth-oauth2
[2] Deprecation of Basic Authentication in Exchange Online — https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online
[3] Block legacy authentication with Conditional Access — https://learn.microsoft.com/en-us/entra/identity/conditional-access/policy-block-legacy-authentication
[4] Microsoft 365 Backup FAQ — https://learn.microsoft.com/en-us/microsoft-365/backup/backup-faq?view=o365-worldwide
[5] Update on SMTP/Client Submission modernization & alternatives — https://www.neowin.net/news/microsoft-has-an-update-on-exchange-online-basic-auth-removal-for-office-365/