TLDR: so sorry to hear about the issue you're experiencing. It looks like there is an issue with Opal's VPN your phone entering in conflict with another VPN. Follow below steps to reset.
What to do about it.
This should reset the VPN and make it work.
We are working on a permanent fix to this problem.
It still doesn't work for me.
If you still have any issues or questions, please shake your phone or take a screenshot while Opal is open to report it directly to our team and we’ll get back to you ASAP.