What are these for?

[blackhorse456]

There are 3 "1.20.3 Trial Keys" in my inventory and I don't know what they are for or how they work.

 

[Primaryss]

There are 3 "1.20.3 Trial Keys" in my inventory and I don't know what they are for or how they work.

Update your launcher to 1.21. Its a key for the trial chamber

 

[DehydratedVenom]

There are 3 "1.20.3 Trial Keys" in my inventory and I don't know what they are for or how they work.

Its for newer version, search on youtube where to go and use as these keys can be handy and give you a bit of profit too if you sell

 

[DakshWagh]

There are 3 "1.20.3 Trial Keys" in my inventory and I don't know what they are for or how they work.

those are trial keys which are available for only 1.21+ versions