Hello - I had the same issue on my iPhone. I tried to text the passes to my phone and the mobile pass was blocked on the browser. I am running a VPN and when I paused my VPN I was able to add the boarding pass to my wallet.
I am guessing the VPN is blocking the URL scheme to link to the wallet because once I paused the VPN it worked both texting and using the "add to wallet" button.
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