When executing a Business Central map that gets this error.
This server has rejected the client credentials.
Step 1 is to check the Business Central connection by verifying with the Microsoft Azure account. Ensure your client credentials and App settings are set correctly as shown in the article below.
Connecting to Dynamics 365 Business Central using an OAuth Token
Step 2 is to investigate the data in the group by records does not include the # character. For Example: for the Item, the item code should not include the # character.
Business Central rejects the # character in the Group by key fields, which leads to this error.
