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I had the similar issue scheduling from my phone. 

I’m using iPhone/Safari.

I created a new set of tabs, then cleared cache under Settings/Safari/Clear history and website data.

back on safari turn off content blockers using the aA button near the address bar, and turn off any other ad blocker type entension. 

closed all apps.

then cleared the Safari again for good measure.

Then using the Safari new tab group, logged onto USPS and it worked without any hiccups!