Hello ahunt,
Thank you for reaching out in Microsoft Q&A.
In Azure Virtual Network's "Quick Access" segment, you should use commas to separate multiple individual ports, not semicolons. Here's the correct format for listing multiple ports:
443,80,445
Simply separate each port number with a comma and no spaces. This format should allow you to list and configure multiple ports in the "Quick Access" segment as desired.
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Best of luck!