Thanks for reaching out, @danielkennedy853. I love to get this sorted out for you.
To start, can you verify the name of the bank account you are trying to reconnect? Any additional information will get us closer to the resolution and check if there's an open investigation about this.
In the meantime, let's try to connect your bank account using a private window. Using a safe browser and accessing the program from there can usually fix the issue.
Check out these keyboard shortcuts:
Command + Shift + N (Safari)
Ctrl+ Shift + N (Google Chrome)
Ctrl + Shift + P (Mozilla Firefox)
Once you log in, try to connect your bank account again. See the below articles for a guide: