Hi,
I have checked the file. It really contains useful information. The error is:
Apr 10 09:39:31 localhost.localdomain suse-migration-prepare[1875]: File "/usr/lib/python3.13/site-packages/suse_migration_services/units/prepare.py", line 145, in perform
Apr 10 09:39:31 localhost.localdomain suse-migration-prepare[1875]: contents = fp.read()
Apr 10 09:39:31 localhost.localdomain suse-migration-prepare[1875]: File "<frozen codecs>", line 325, in decode
Apr 10 09:39:31 localhost.localdomain suse-migration-prepare[1875]: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 8032: invalid continuation byte
According to the source code the service is opening /etc/hosts and failing because of Ü character.
Looking into supportconfig, I see you have two lines:
XXX.25.98.48 udapmnzXXXXXX udapmnz # AIP UBIS-Server f�r temp. Kundensysteme
XXX.168.150.53 iautoXXXXX # Cluster 1 HA-Autom. Abl�ufe
Remove the ü and try again the migration.
Have a nice weekend,
Ahmad