Can't login to any servers since migration

Ever since I migrated, when I try to get into any minecraft servers like Hypixel or Manacube, it just says Failed to login: null

What I expected to happen was...:
I should be sent to the server that I selected

What actually happened was...:
I says "Failed to connect to the server" then under it, it says "Failed to login: null"

Steps to Reproduce:
1. Migrate
2. Login to Microsoft account
3. Get into launcher

4. Enter minecraft on version 1.8.9

4. enter the server ip

5. Select the server and press join server