Server error when connecting git repository on self-hosted 1.5.4

Instructions to replicate:

1. Go to create function
2. "Connect Git repository"
3. Click "GitHub"
4. On the github appwrite functions, under "repository access", hit "save"
5. After saving, I am redirected back to my appwrite backend with the following error:

message "Server Error"
code 500
type "general_unknown"
version "1.5.4"

Here are the errors as they appear in docker logs:
[Error] Timestamp: 2024-04-17T19:54:29+00:00
[Error] Method: GET
[Error] URL: /v1/vcs/github/callback
[Error] Type: Ahc\Jwt\JWTException
[Error] Message: Signing key cannot be empty
[Error] File: /usr/src/code/vendor/adhocore/jwt/src/ValidatesJWT.php
[Error] Line: 34
[Error] Timestamp: 2024-04-17T19:54:29+00:00
[Error] Method:
[Error] URL: /favicon.ico
[Error] Type: Appwrite\Extend\Exception
[Error] Message: The requested route was not found. Please refer to the API docs and try again.
[Error] File: /usr/src/code/app/controllers/general.php
[Error] Line: 860

Googling the first issue "Signing key cannot be empty", I found this post where a user resolved the issue by specifying _APP_OPENSSL_KEY_V1 in the .env file:
https://github.com/appwrite/appwrite/issues/6043

However, I already have an app openssl key in my env file.

I verified the callback URLs and webhook specified in github through the documentation at https://appwrite.io/docs/advanced/self-hosting/functions. I also ensured the .env file contains the correct github settings (app name, app id, id, secrets, private key...)

This worked before, I don't know when it stopped working as I haven't touched functions in a while.

also tried removing callback urls in github and re-adding them. I also disconnected github integration from appwrite to try and restart the connection process, but no luck.

Thanks for the help