Transfer Wallet Transportation card from one AppleID to another.

Once a card is added to Apple Wallet it’s controlled by the issuer. If the issuer permits a transfer, the step by step instructions are in the Apple Support article I linked below. The section on transferring is near the bottom of the article.

Add a Suica, PASMO, or ICOCA card to Apple Wallet - Apple Support

Seems it’s locked for its lifetime to a single Apple Account (formerly Apple ID). As a last resort you can try talking Suica support team. If I learn anything more I’ll update this thread.

1. (3) “Make sure that you sign into iCloud on all your devices. On your iOS device, you need to set up Face ID, Touch ID, or a passcode. On your Apple Watch, you need to set up a passcode. If you remove your passcode or sign out of iCloud, all credit, prepaid, and Suica, PASMO, or ICOCA cards are removed from that device. When you remove a Suica, PASMO, or ICOCA card from any device, the remaining balance will be stored and available to be transferred to the same or another iPhone or Apple Watch that is signed into iCloud with the same Apple ID.”