Scenario:
Today I got the request to provide permission to a AD Group on one of the SSRS report. When tried to provide browse or any other permissions such as Content Manager, My Reports, Publisher or Report Builder, got below error.
The user or group name 'Group Name' is not recognized.
Solution:
You need to go to Active Directory user and Groups and then check the properties of your Group.
Make sure Group Scope is Global or Universal and Group Type is security. I had it distribution and that is why SSRS was not able to recognized the AD group.
Once I changed the Group Type to Security, SSRS was able to recognize the AD group and was able to provide required browse permission.
SSRS Error Solution: The user or group name '' is not recognized.