This started May 12, 2020, possibly earlier, but I noticed it when a customer on West Coast (we're in Delaware) ordered something and asked if we 'had any cheaper shipping (than Priority Mail); Turns out the FedEX Ground option, which has been integrated and working for over a year, just does not appear to the customer when shown different shipping options. I did the following:
1. Checked all config and settings for shipping carriers.
2. Disabled and re-set up the Fed Ex under the integration part of 'settings' for shipping. It shows up and tests as working.
3 I ran a test order from a test address I use for west coast and the FedEx Ground price and option do not appear.
I've sent an email support request, but I thought I'd post here too. Also, I use shippo to create labels and it interfaces with FedEx to make labels fine, so it seems to me that the issue lies in the Shopify somewhere.
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This is an accepted solution.
It was some sort of integration issue, probably at server level, something between Shopify and Fedex, and nothing to do with my settings. What I did was totally take off the Fedex options and completely re-did the set up. While the answer I got from Shopify support was basically "not problem here", within an hour of my submitting support request, and my re-doing the setup, FedEx options came up fine. Good luck.