I've noticed that the last character of EPP values tend to be minor punctuation ([,.] etc.), which is ignored whenever I double-click to copy & paste.I took the CSV exported from GoDaddy, striped it down to multiple lines of
domain, EPP
domain, EPP
domain, EPP
..
and pasted that in.
That failed.
When I removed the space between the comma and the first character of the EPP key, it worked (so far for the few I retried).
My guess is that the space confused the form parsing code. Or maybe it was just a glitch.
In any event, I've been now moving domains successfully, and in the morning I'll be re-trying the bulk of the remaining names.
BTW, in my initial retry attempt I noticed that some domains were being flagged as not transferable, something I didn't catch when i attempted to moe 30 names at once.
One name was "questionable", two others were too close to the expiration date. I got in touch with Namecheap support and they arranged to get these names transfered as well.
And once all the ducks were in a row I've been getting pretty quick turnaround times from both namecheap and GoDaddy.
So, so far so good.