YaST and Zypper Migration Fails on SLES 15 SP4 to SP5 on SUMA-Registered Clients

SUSE Linux Enterprise Server 15 all Service Packs
SUSE Linux Enterprise Server 12 all Service Packs
SUSE Multi Linux Manager 5.0
SUSE Manager 4.3

The SLES 15 SP4 system is registered to the SUSE Manager 4.3 server as a client.

When the customer migrates from SLES 15 SP4 to SP5 using the YaST or zypper migration commands, it is returning error messages:

1. YaST Migration 

        │ The system is not registered,        │
        │ to run the online migration you need │
        │ to register the system first.        │

2. zypper migration

# zypper migration

Executing '/usr/bin/zypper patch-check --updatestack-only'

Loading repository data...
Reading installed packages...

0 patches needed (0 security patches)

Executing '/usr/bin/zypper ref'
...
Executing '/usr/bin/zypper --disable-repositories --xmlout --non-interactive products -i'

Executing '/usr/bin/zypper --no-refresh --non-interactive install --no-recommends --auto-agree-with-product-licenses -t product SLES'

Can't get available migrations from server: Credentials file is missing
'/usr/lib/zypper/commands/zypper-migration' exited with status 1

3. SUSEConnect --status

# SUSEConnect --status
[{"identifier":"sle-module-basesystem","version":"15.4","arch":"x86_64","status":"Not Registered"},{"identifier":"sle-module-server-applications","version":"15.4","arch":"x86_64","status":"Not Registered"},{"identifier":"sle-module-desktop-applications","version":"15.4","arch":"x86_64","status":"Not Registered"},{"identifier":"sle-manager-tools","version":"15","arch":"x86_64","status":"Not Registered"},{"identifier":"SLES","version":"15.4","arch":"x86_64","status":"Not Registered"}]

Because SLES 15 SP4 client system is registered to the SUSE Multi Linux Manager (SMLM - previous SUSE Manager ), migrate the client using SMLM Web UI:

Product Migration Documentation can be found here:

https://documentation.suse.com/suma/4.3/en/suse-manager/client-configuration/client-upgrades-product-migration.html

https://documentation.suse.com/suma/5.0/en/suse-manager/client-configuration/client-upgrades-product-migration.html

After the customer bootstraps a SLES client that was registered to the SCC, the SCC registration information is removed, so the YaST and zypper migration OS Migration commands no longer work from the client side.