Couple of things I tried:

1. I created a webhook connector in msft teams and copied it Notifications destinations via Admin page -> New destination -> from dropdown I selected Microsoft teams -> added webhook url and saved it.

outcome: I don't get the option to test it and the destination doesn't show up in databricks job notification settings

Second, instead of selecting the type Teams, while creating destination, I created the it by selecting webhook and copied msft teams webhook in the url field and saved it.

outcome: the test option failed with 400 error.