You are configuring OAuth 2.0 in Mail adapter as per SAP Note 2928726 - NewF: Support for OAuth 2.0 in PI Mail adapter. In the step of getting Refresh Token, you get "id_client" as refresh token, which is actually incorrect:
SAP Netweaver 7.5
Netweaver, Process Orchestration, mail adapter, OAuth 2.0, refresh token, id_client, invalid_client, Authorization code, AADSTS500112 , KBA , BC-XI-CON-MAI , Mail Adapter , Problem
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