Username/password overlay on credit union website blocked with 403 error

[That_One_Determined_Falcon 0]

Apologies if I make any forum-related faux-pa as I haven't effectively used a forum in years and this is my first post here.

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Okay, so my credit union's website is https://www.monroecommunitycu.org/onlineresources and it uses an overlay popup for the username & password fields. Login services seem to be handled by a separate website, https://www.itsme247.com/. And, if I have my VPN disabled, it runs fine; however, if I have it enabled—it doesn't matter which server; it seems to happen on almost every one if not every one—I get a 403 Forbidden error for the overlay.

Screenshot attached.

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Specs:

OS: Linux Mint 22.1 Cinnamon
Browser: LibreWolf 138.0.4-1
VPN Client: Eddie 2.24.6
VPN Type: WireGuard

I would also like to say that I do use browser extensions like uBlock Origin, NoScript, Disconnect, etc. However, I've had the same addon settings for many months now, and this issue didn't start until I started using AirVPN, so I'm fairly certain it's related to the latter.

If there's any other information you need that I forgot to include, please let me know and I'll do my best.

Cheers.

Edited ... by That_One_Determined_Falcon
Evidently, I cannot use HTML code in my text and must use the GUI editor