Have you tried turning off Secure Boot in the BIOS? Sometimes that appears necessary.
Also FWIIW, I have been using Acronis for around 20 years and recently got sick of the subscription cost and other issues associated with the program. So now I am using Hasleo Backup Suite Free. The boot rescue iso for HBS works just fine on my Ventoy disk - boots up etc.
Also FWIIW, I have been using Acronis for around 20 years and recently got sick of the subscription cost and other issues associated with the program. So now I am using Hasleo Backup Suite Free. The boot rescue iso for HBS works just fine on my Ventoy disk - boots up etc.