Minecraft + Nintendo Switch - You cannot play online multiplayer Error

Does she have a Nintendo switch online subscription? It is required if she will be playing an online multiplayer game such as Minecraft.

Have you an active Nintendo Switch Online Subscription? I ask this because I found the following Q/A on Minecraft Nintendo Switch FAQ:

Can I play Realms on this edition?

Yes, Realms is available on the Bedrock edition of Minecraft for Nintendo Switch. To play online on a Nintendo Switch, you need to have a Nintendo Switch Online subscription, so this is a requirement for playing on Realms. More information about Nintendo Switch Online can be found here.

Furthermore, can you post the entire error message (better a screenshot/photo)?

Hi, I hope you're doing great out there despite the issue that you're experiencing. I am an Independent advisor and I am here to help you in regard to your concern.

When you sign in to https://account.xbox.com/settings kindly “block” these settings if they’re already on “allow” then submit and after that “allow” again then submit.

You're welcome and thank you for your kind understanding.

Uff, okay, I'll reach out to them if I still have this issue tomorrow. Thanks, Francia.