Hi @Palucci12
To create URL in Post message Teams, you need to perform the following steps:
1. Firstly, click on 'Code View' button on the top of the body email as shown below:

2. Next, create the html hyperlink tag in between the <p></p> tags as shown below:

here is the html tag used for hyperlink:
<a href="(hyperlink)">(Title)</a>
Pls replace the link & title as per your need in the above code.
If this helps & solves your problem, please remember to give a 👍 and accept my solution as it will help others in the future.
Thanks