Bug type

Regression (worked before, now fails)

Beta release blocker

No

Summary

in #76880 and #76742 i outlined the issue.
it keeps getting short patches that don't address the issue, don't test it, and, i am commenting in the PR that I have tested and it is not resolved. Nonetheless they get merged and my issue closed.

Google chat has been broken.

2026-04-29 git works.
2026-05-02 git does not work

both are installed from github.

error channels/googlechat {"subsystem":"channels/googlechat"} Google Chat message send failed: Error: unsupported_grant_type: Invalid grant_type:

is the error logged

Steps to reproduce

configure google chat as a channel
send a message to openclaw
observe log

Expected behavior

prior to this regression i could use googlechat

Actual behavior

googlechat inbound broken

OpenClaw version

c59c20e

Operating system

ubuntu 26.04

Install method

git / pnpm

Model

N/A

Provider / routing chain

N/A

Additional provider/model setup details

N/A, doesn't hit llm models

Logs, screenshots, and evidence

12:19:44+00:00 error channels/googlechat {"subsystem":"channels/googlechat"} Google Chat message send failed: Error: unsupported_grant_type: Invalid grant_type:

Impact and severity

Affected: all google chat users
Severity: prevents using channel entirely
Frequency: 100%

Additional information

2026-04-29 works.
the PR given above does change the behaviour, but, doesn't correct.