@Simoney69​ 

Personally, I wouldn't expect Trellix' newer core (or other) licensing models to automatically grant entitlement rights to deploy older node-based products unless Trellix's product use rights, grant letter, SKU migration guide, or ordering documentation explicitly state backward-use (downgrade) rights. If you have confirmed that you have such backward coverage included license entitlement wise you will likely to have manually apply this to the license objects.

If you require further guidance from the forum members you may want to include more details about what you have tested.

Thanks,

John Sorensen