I ended up using a different browser, then created a new Xfinity user, then a new MLB account and went through the activation process and it worked. This was stupid it took all that to get it to work, but the Xfinity rep I spoke with on the phone had no idea what to do. Their solution was to use the Stream app which is ridiculous since it will only work on your in-home network.
Since this is the 3rd year in a row that I have had to go through this I am writing down what I did so I don't forget next season. The obvious solution would be for Xfinity and MLB to get it together and address this since so many people seem to be having this issue.
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