Dear support,
We have developed a custom SharePoint provider hosted Add-In on SharePoint Online 1 year ago. Since this morning, this add-in is not working anymore. We get this error message:Invalid JWT token. Could not resolve issuer token.
Apparently, this client secret is not valid anymore and needs to be renewed
FYI, we have follow the procedure explained here:
https://msdn.microsoft.com/en-us/library/office/dn726681(v=office.15).aspx#sectionSection2
However, this is not working.
A new client secret has been generated and the web.config of the application (hosted in Azure SouthEast Asia) has been updated as explained in the tutorial.
FYI the version TokenHelper.cs is using the latest version and contains code to manage SecondaryClientSecret
Do you have any ideas about this issue ? Why does the steps explained in the tutorial are not working ? Is there some delay
Thanks for your help. FYI this issue is really critical as the application is used in a day to day basis by our client
Regards