https://VCF-FQDN/ui/api/internal/logincallback endpoint. Simultaneously, the UI displays a PERMISSION_NOT_FOUND error status.VCF 4.x
VCF 5.x
SDDC Manager requires certain permissions for users to be allowed to login to the SDDC Manager UI.
Using an administrator account, login to SDDC Manager and assign the affected user a certain role like OPERATOR, ADMIN or VIEWER as per below mentioned documentation.
Configure SDDC Manager for Identity and Access Management for VMware Cloud Foundation