AD Sync for Central stopped working last night

I added a new API credential and added it. I get the error "Can't connect to Sophos Central due to Connectivity Issues when I click on validate Credentials

The log file shows the following:

08:07:52.690 Information [Th 6] [Sessions: redirectTo=, apis=[Apis: upe=[ApiUris: url=https://amzn-eu-central-1-euc1business.api-upe.p.hmr.sophos.com/frontend, ng_url=https://api-CloudStation-eu-central-1.prod.hydra.sophos.com/api, fallback_url=/fp/2df862b6-afdc-4cd1-bc11-52c52545c9e4/api]], mfa_required=False]
08:07:52.690 Information [Th 6] Sophos ID URL used: id.sophos.com/.../token
08:07:53.238 Information [Th 6] bootstrap URL used: api.central.sophos.com/.../v1
08:07:53.363 Information [Th 6] HTTP request to api.central.sophos.com/.../v1 error Unauthorized: {
"error": "BadServerResponse",
"correlationId": "29263c69-003f-458a-8a37-41fea6460a5d",
"requestId": "c4a0b9e4-1a77-4130-97fc-9507b9ad3ce3"

I'd really like to get this working, I unistalled and reinstalled it and that didn't help.