Okay, this was an easy fix. Whitelist the email domain (for your Teams link) in Server Settings > Email settings. I successfully added mine after whitelisting.
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I'm having a similar problem. When setting up an alert notification by email, the email address for the Teams channel is not being accepted. I'm still researching the issue.
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Try removing the port number at the end if you are using Splunk Cloud. This was the issue in my case. The documentation does not reflect this issue as of this writing.
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Try using single quotes for each parameter. This is how I fixed my error. Example: >./splunk add monitor /var/log -index 'main' -sourcetype 'linux'
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