It can't be invited to a server.

[IngrownMink4]

As Discord says:

This bot cannot join more servers, as it has not been verified or is requesting gateway attempts for which it is not verified. Ask the bot developer to verify it (https://dis.gd/bot-verification) so you can add it to your server.

[ming736]

The bot can't join more than 100 servers if it isn't verified.
Once it gets verified, you can add it to your server. For right now, you have to wait until the bot gets verified.