Microsoft Teams Configuration Tab: We couldn’t save your tab settings. Please try again.

You can troubleshoot JavaScript in Teams using the web based version of teams via:

If you're building a configuration tab and get the following message:

We couldn't save your tab settings.

You can bring up F12 Developer Tools to see what's going on and even debug your JavaScript eg:

Clicking on the configuration.htm you can see I've forgotten to use the SSL ngrok endpoints - which was the cause of this error.  This is a prerequisite referenced here:

In case this doesn't solve your issue, here's some other links that may also help with this error:

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