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Hi @plain-planet-80115 ,it's quite likely that it's related to the different default configuration between cloud-init in SLES and Ubuntu. Make sure that all relevant cloud-init services are enabled on your SLES 15 SP4 template:

systemctl enable cloud-init.service
systemctl enable cloud-init-local.service
systemctl enable cloud-config.service
systemctl enable cloud-final.service

You can find an in-depth explanation here: https://www.virtualthoughts.co.uk/2023/01/18/debugging-cloud-init-not-executing-runcmd-commands/

Hey @quick-sandwich-76600, Thanks for your suggestions. I will try this out now.