Transfer Not visible: 2 out of 4 identical .cloud domains

Out of 4 .cloud domains, 2 domains could not start to transfer from old registrar. All four .cloud domains were registered on same day with same settings on another registrar. DNS / NS are set and managed from Cloudflare.

From Cloudflare domain’s Overview screen I can see “Transfer to Cloudflare”

When I proceed further on “Transfer”… I do not see domain any more…

And Transfer is Unlocked in current registrar. Any help is appreciated…