For about month, my store has been making and completing sales. Now, suddenly it fails on address verification.
Vertex is not being used and it clears if we choose Shipping Option 2 (Overnight shipping at $34.95)
If a person chooses standard shipping, it fails Option 1 (Mageplaza Shipping methods module).
We even switched their amounts and it seems to fail only if 8.95 shipping is used not matter if it is option 1 or 2. Seems odd to be tied to amount.