Facing issue to change tenant database from VBCS to Oracle ATP database

Summary:

We created ATP database and planning to configure 'Tenant database' of VBCS to point out Oracle ATP database. We are following all the required security measures and also used the ADMIN user holding all the required privileges.

But still we are getting error as "Change Database failed Error: undefined". We are unable to figure out the reason.

Could some one let us know in case anyone come across this issue with the debugging steps if possible.

Thank you in advance!

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