I’ve added IPv6 to the domains thinking that would help, with a single shared IPv4, but still fails with the above. Any workarounds for this besides deleting the secondary domain?
The site in question was added to the source server in 2018 and is on a shared IPv4 address. Both the main and secondary have SSL attached and work fine. I added dedicated IPv6 addresses to the account hoping that would trick the importer into allowing it, but didn’t help.
For anyone that possibly runs into this issue, which seems like maybe something unique going on with my server, but just in case it helps someone else…
The Mass Import in my case did not want to pull IPv6 from the pool.
Simple fix was just doing the import selecting No IPv6 Pool.
After the import finishes you can go into the account and add the IPv6.