Can't play online for it takes two

The first time I clicked play online, it would go through the connecting screens and then this error would pop up.  I deleted and redownloaded, I changed wifi, I cleared cache and would still get that error. Then one time I restarted the switch and tried to connect and then it worked. Then during mid play about 10 mins later I got kicked out and when I tried to play online it gave me the error again. When I play local there's no issue. Why is this happening?? My sister paid for this game to also try and play with me online and she has no issue playing online but why do I?