BC Observatoryunofficial, made by waldo
code change · fixAL Developmentofficial - Microsoftreviewed - checked by Opus

#12140 [Email - SMTP Connector] Fix OAuth Base64URL token parsing

OAuth2 SMTP authentication now correctly decodes Base64URL tokens by normalizing them to standard Base64 before parsing, fixing intermittent authentication failures when JWT payloads contain URL-safe characters.

Open in Claude12140.mdPull request #12140

Pull request · merged into main (BC30) on 2026-10-01 by onbuyuka · 2 files (+16 -1), 1 AL · fix · tier official · reviewed (checked by Opus)

What changed

  • Base64URL tokens are converted to standard Base64 format before decoding
  • Fixes authentication failures when JWT payload contains ‘-’ or ‘_’ characters
  • Regression test added to cover Base64URL-specific characters
  • Existing username extraction and authentication flow unchanged
  • Resolves issue where standard Base64 decoder raised invalid encoding errors
  • Behaviour changes for users or extensions.

AL objects touched

Context

  • Work items: AB#652319
  • Labels: AL: Apps (W1), Team: Integrations
  • Systems: development
  • From the description: “Normalize the OAuth access-token payload from Base64URL to standard Base64 before decoding it.”

Source: metadata of a merged pull request in microsoft/BCApps (bcapps): title, labels, changed paths and counts, with a summary in our words. No source text and no description beyond one short quote (D10, D61).