Thanks for the support Ivan!

I am not exactly sure what happened with my Alby Hub but sometime within the last week, I lost the ability to send or receive sats. Alby Hub support instructed me to unlink my connected wallet and restart my Hub. After a few minutes, I unlocked my Hub with my password and linked my Alby account. Shortly after, everything started working again.

You can restart your Hub in settings. See the red arrow in the screenshot below.