Yoda?
At some point Obi Wan should consider meeting up with Yoda. I don’t see why he wouldn’t know where he is.
Obi Wan clearly has a Force block and just had his ass handed to him by Vader.
It would be strange if he didn’t try to contact Yoda. Maybe get more training, which helps him achieve the path to immortality. It would make his ESB line of Yoda instructing him more powerful.