11b is the error for a protocol mismatch.
You will need to disable the RPC protocol on the machine sharing the printer since the protocol is not supported on 2008R2.
The protocol was added in Jan of 2021 but not enabled by default until September of 2021.
I'm on a phone. The registry key is referenced in other posts. Search for 11b. You will disable on tbe print server.
Make sure the server name is 15 characters and less or you will see 709, invalid printer name, all day.