Powerpcspe debian snapshot expired repository key update

Did someone managed to fix expired key for powerpcspe LXC debian snapshot repo and how ?
I had not been successfull so far

from this

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://snapshot.debian.org/archive/debian-ports/20190518T205337Z unstable InRelease: The following signatures were invalid: EXPKEYSIG DA1B2CEA81DCBC61 Debian Ports Archive Automatic Signing Key (2019) <[ftpmaster@ports-master.debian.org](mailto:ftpmaster@ports-master.debian.org)>

I went with command wget -qO- https://www.ports.debian.org/archive_2021.key | apt-key add - to this:

W: GPG error: https://snapshot.debian.org/archive/debian-ports/20190518T205337Z unstable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DA1B2CEA81DCBC61

but not any further as apt-key update is not working anymore