Hi @me1k,
Welcome to the Auth0 Community!
It looks like you have changed the access token expiration time correctly. However, let me clarify that the token expiration is in seconds instead of milliseconds. See below:
Additionally, the value 1706293978 you shared is the expiration time in seconds since Unix epoch. Using jwt.io to decode my token, here is an example:
Hovering over the time gives you the GMT date and time: 
To verify that your expiration time is correct, you can look at the exp and iat claim of your access token.
Then you can perform the following calculation:
- Token expiration (in seconds) =
exp(Expiration time in seconds) -iat(Issued at in seconds)
The token expiration time should match the value you set in your token settings.
Let me know how this goes for you.
Thanks,
Rueben