Trying to connect new sp 2019 farm with current PHA server (IIS). The current PHA server is using for sp 2013 farm and working properly. Everything was done and cert registered as described here Everything was checked as described here and here

But still getting this error when trying to open an app from sharepoint site:

Un-whitelisted client sent us an OAuth token. Client Id : '*************'.

Can anybody help with this? Thank you.

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