Can't create Logpush Job: fail to prove ownership

I want to create a Logpush job. dest is R2.
paid plan.
Workers Trace Events

followed this document.
https://developers.cloudflare.com/logs/get-started/enable-destinations/r2/

created R2 token (read & write for a new bucket)
selected below
- Workers trace events
- default data fields
- R2 objects
entered bucket path, access key id, and secret access key
- if some key is wrong, "Validate access" will fails, but I didn't failed at this step, so I guess secrets are correct.
then, always fails at the last "5 Prove Ownership" step

pq: new row for relation "jobs" violates check constraint "jobs_buftee_can_only_be_logstream" (Code:1002)

pq: new row for relation "jobs" violates check constraint "jobs_buftee_can_only_be_logstream" (Code:1002)

pq: new row for relation "jobs" violates check constraint "jobs_buftee_can_only_be_logstream" (Code:1002)

pq: new row for relation "jobs" violates check constraint "jobs_buftee_can_only_be_logstream" (Code:1002)

Cloudflare Logpush supports pushing logs directly to R2 via the Cloudflare dashboard or via API.

Gyazo