Azure boot problem in linux machine

Hi, I received a warning indicating that the VM agent is not ready, and I am unable to connect to the VM via SSH. After restarting, I encountered the following error in my boot diagnostics:

	 `Virtual Machine Boot Summary `
````				 1 SCSI Disk (0.0)`

`				 The boot loader did not load an operation system`

`				 2. Network Adapter (002248758C29)`

`				 A boot image was not found`

How can I resolve this issue? I have very important data on the VM.

OS: Linux Debian 10

Thank you in advance for your assistance."

Br,

Nasimjon