Friend cant join server on bedrock

[gleaming bear]

MY friend recently asked to join my server, hoodeddomain, so i gave him the ip to join, but when he tried to join, he got the error "Unable to connect to world" HE is on bedrock, 1.21.51, and im on latest java release, my server is paper 1.21.1, with viaversion, i dont know why he cant get in, and if he trys to connect to minehut intself, he gets invaild ip error, help please

[versed schooner]

Have them try joining 2-3 more times if still doesn't fix i think it's just minehut doesn't support 1.21.51 yet