Important: TAS 12.6.1 is required for Dynamics 365 Finance & Operations 10.0.50 and later

Microsoft’s 10.0.50 update for Dynamics 365 Finance & Operations requires users to update to TAS 12.6.1. TAS versions without our fix will produce errors when built on 10.0.50 or later.

The fix is included in TAS 12.6.1, released on November 4, 2026. We are not releasing fixes for earlier versions. Every customer must move to TAS 12.6.1, whatever version they run today.

Who is affected

Any environment moving to 10.0.50 or later, including test and sandbox environments on Microsoft’s preview.

What to do
  1. Install TAS 12.6.1 before or together with your 10.0.50 update.
  2. Check your customer-specific fixes. TAS 12.6.1 may not include every fix made for your organization. Review the release notes or contact support before upgrading.
  3. Plan your testing now. Moving to a new TAS release can require extensive testing, especially from older versions. Book time and resources now rather than waiting for Microsoft’s deadlines.

Key dates
  • October 23, 2026: Microsoft 10.0.50 preview available
  • November 4, 2026: TAS 12.6.1 released
  • December 22, 2026: 10.0.50 generally available
  • January 31, 2027: Microsoft begins automatic production updates
  • February 16, 2027: Customers on 10.0.48 must be on 10.0.50 (it can’t be skipped)
  • May 21, 2027: Customers on 10.0.49 must move to 10.0.50 or 10.0.51 (both need the fix)

Questions? Contact axsupport@sksoft.com.