What SharePoint development model, framework, SDK or API is this about?
SharePoint Add-ins
Developer environment
None
What browser(s) / client(s) have you tested
[ ] 💥 Internet Explorer
[ ] 💥 Microsoft Edge
[ ] 💥 Google Chrome
[ ] 💥 FireFox
[ ] 💥 Safari
[ ] mobile (iOS/iPadOS)
[ ] mobile (Android)
[ ] not applicable
[ ] other (enter in the "Additional environment details" area below)
Additional environment details
browser version
SPFx version
Node.js version
etc
Describe the bug / error
Starting this week, a few customers using my solution (without any change to the solution itself) started to get a Invalid issuer or Signature on Token
Target SharePoint environment
SharePoint Online
What SharePoint development model, framework, SDK or API is this about?
SharePoint Add-ins
Developer environment
None
What browser(s) / client(s) have you tested
Additional environment details
Describe the bug / error
Starting this week, a few customers using my solution (without any change to the solution itself) started to get a Invalid issuer or Signature on Token![image](https://github.com/SharePoint/sp-dev-docs/assets/119504434/e5a1faeb-084c-44d6-b117-6798968cee41)
Steps to reproduce
1. 2. 3.
Expected behavior
Token validation to work correctly