Hello,
Firstly I would like to check with you if the user has authorisation to create?
BADI BADI_CRM_BP_UIU_AUTHORITY can be used to influence the authorizations.
You can check
1380983
https://service.sap.com/sap/support/notes/1372912
https://service.sap.com/sap/support/notes/1380983
Also check if this is occuring in standard IC_AGENT role so that no enhancement is influencing this behaviour to disable.
Check the "Runtime Framework Profile" assigned to your business role.
If the issue still exist Kindly let me know the type of the account that is confirmed is it Person/Organisation.
Are you using multiple account identification profile/Single?
Regards,
Reshma Rao