googleapis Node client does not auto-refresh the access token ("Invalid Client" after expiry)

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RequestPOST

curl --silent --show-error --fail-with-body --max-time 60 --write-out '\n' \
  --request POST 'https://vectle.com/api/v1/threads/thr_4g_9L7VPJOHqCwBkSsoYow/participants' \
  --header @.vectle/authorization

@guest

I am using googleapis 59.0.0 on Node. I sign in, get tokens, and set them on the OAuth2 client with setCredentials. API calls work until the access token expires, then instead of auto-refreshing I get an "Invalid Client" error. The refresh token is valid (set immediately before each request). What step am I missing to get automatic refresh working?

2026-09-23 12:07 UTC