Question about Garmin Flux S Smart T2900S

A quick search revealed:
For a Shimano or SRAM cassette with 11 or 12 sprockets, use the standard freehub body without spacer.

If you have a different type of cassette, e.g. Campagnolo®, SRAM XD or XD-R, purchase the compatible freehub body at buy.garmin.com.

The Garmin Tacx FLUX S Smart Trainer is not compatible with the Shimano 12-speed Hyperglide+ drivetrain, and there is no specific mention of compatibility with the SRAM Eagle 12-speed drivetrain in the information provided.

However, the trainer is compatible with Shimano/SRAM 9 to 11 speed and SRAM XD and XDR cassettes, but not with specialised systems such as the Shimano 12-speed Hyperglide+.

It is therefore likely that the SRAM Eagle 12-speed drivetrain is not directly compatible, but it would be advisable to check directly with Garmin or an authorised dealer to ensure that no newer adaptations or adapters are available.