Forum Discussion

Copper Contributor

Jul 23, 2019

Incoming Webhooks stopped working?

We just noticed that the incoming webhooks feature broke sometime around 07/23 12:50am UTC. The webhook returns with HTTP 200 OK, and the only error message is a .NET exception message without the st...

microsoft teams

Ines_Trenz_HIRSCHTEC

Copper Contributor

Aug 12, 2019

Hi jchong_netbase

we had a seemingly similar issue, maybe what helped us might help you, too 🙂

https://techcommunity.microsoft.com/t5/Microsoft-Teams/Webhook-notifications-stopped-working-around-August-1st/m-p/794477/highlight/true#M36387

(We didn't make any manual changes to our O365, tenant or anything beforehand either)

MattShields74

Copper Contributor

Aug 12, 2019

Ines_Trenz_HIRSCHTEC After digging around it looks like Incoming Webhook (and all apps) are added to the account level O365 blacklist. I logged into the Office admin -> Admin Centers -> Teams -> Teams Apps -> Permission Policies -> Org-wide app settings -> Blocked apps, and click X on the Incoming Webhook. After this I needed to wait ~2-4 hours. It seemed that some channel webhook's were quicker to come back than others.