Pi 4 Hardened Repsitory Only x86_64 (64 bit) Linux servers are suported error

Hello

For testing Inmutable backups using ubunto server LTS 22.04.3 following

Part 1 - Build an immutable backup repository for Veeam Backup & Replication. | Experts Exchange (experts-exchange.com)

Great expirience and working very fine on some spare PCs i had lying around.(doing bare Metal recoverys and testing different storage medias from internal HDD to usb 3.x to iscsi) 

Now i tryed to replicate it on a Rasbery Pie 4 but when i try to add it as a Hardened respository  in Veeam i get:

Only x86_64 (64 bit) Linux servers are suportend.

lscpu shows 32bit, 64 bit and i used a 64 bit LTS version. Now im not the firmest on Linux so mayhaps im overlooking something trivial. Anyone got an idia?

Sascha Wagner