HA to Google Assistant integration broken

Can anyone please assist. My Google to HA integration via Cloudflare has been working for months but stopped a few days ago. I did not change any of the configurations. Initially it wouldn’t update the devices so I tried unlinking and relinking the accounts in Google Home. The HA log-on screen is presented so Cloudflare is redirecting OK, but I shortly get the unhelpful error message "Could not reach [test] “account name. Please try again”. The account has been set up in the Google Console.

The error log in the Google Console is always one of two

{
“insertId”: “qdjctyf3hw7ox”,
“jsonPayload”: {
“syncLog”: {
“syncs”: [
{
“status”: “”,
“requestId”: “14987588423987527690”,
“httpLatencyMsec”: “648”
}
]
}
},
“resource”: {
“type”: “assistant_action_project”,
“labels”: {
“project_id”: “g-to-home-assistant-57282”
}
},
“timestamp”: “2023-09-21T15:26:47.177902958Z”,
“severity”: “ERROR”,
“logName”: “projects/g-to-home-assistant-57282/logs/assistant_smarthome%2Fassistant_smarthome_logs”,
“receiveTimestamp”: “2023-09-21T15:26:47.177902958Z”
}

or
{
“insertId”: “qdjctyf3hw7ox”,
“jsonPayload”: {
“syncLog”: {
“syncs”: [
{
“status”: “”,
“requestId”: “14987588423987527690”,
“httpLatencyMsec”: “648”
}
]
}
},
“resource”: {
“type”: “assistant_action_project”,
“labels”: {
“project_id”: “g-to-home-assistant-57282”
}
},
“timestamp”: “2023-09-21T15:26:47.177902958Z”,
“severity”: “ERROR”,
“logName”: “projects/g-to-home-assistant-57282/logs/assistant_smarthome%2Fassistant_smarthome_logs”,
“receiveTimestamp”: “2023-09-21T15:26:47.177902958Z”
}