I don’t know if it’s a problem with pulsar or my operation. Can anyone help me? Thank you very much.

I believe this is due to the order in which you performed the operations. You should create the namespace and topic in both clusters before starting the geo-replication process. HTH

i am using a public configuration store shared between two clusters，so the two clusters will see each other when started. So i donot understand，because i do not need start geo manually

I replied in the github discussion

@David K Hi, Sorry to only reply to you so late. I have reproductioned this problem, and replied in the github discussion https://github.com/apache/pulsar/discussions/22341