We have a newer 6.5 vcenter that I am trying to add a particular user to a particular VM for management but the following error message occurs
The "Add permission" operation failed for the entity with the following error message.
Provider method implementation threw unexpected exception: %s
All vCenters are 6.5 U3. However two of them this works on have been upgraded from 5.5. Has this type of permission setting been deprecated. If so is their a workaround? Otherwise I'm at a loss. Even setting the permissions from the top down gives me the same error. The only way I can set the permissions is from the "Global Permissions" but I do not want them to even see anything other than what they are allowed
Following articles still give me the same error
I think this situation will happen when you try to upgrade from windows-based vCenter to the appliance-based.
Please look at the following link. It's exactly same as your problem, and the solution seems to be reliable:
Ar you giving that particular user direct access? Try to use a group with the user as a member and try again setting permission.
Does the account have a space in their user ID?