Hello @Astabrak Sabah
Thank you for your post.
For this issue, I wonder if you have followed the next troubleshooting guide below:
https://learn.microsoft.com/en-us/azure/migrate/migrate-appliance#manually-update-an-older-version
Furthermore, there may be another fact that can be a blocking URL to connect to azure migration service so, you can either make this procedure from on-premises to azure via EXPRESSROUTE connection or Internet connection since replication from on-premises via IPsec tunnel is not support only for Failback testing.
Looking forward to your feedback,
Best Regards,
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.