rootUrl is not valid when creating admin account

[R]

I can't get past initial setup with email verification and domain based user auth. 
configuration follows: 

- internal postfix SMTP (working when tested) 

- Email login
- Users authenticated via email address set and unset, same response
- domain is different than the one used for sandstorm

- Nginx reverse proxy pointing to sandstorm
SERVER_USER=sandstorm
PORT=6080
MONGO_PORT=6081
BIND_IP=127.0.0.1
BASE_URL=https://sandstorm.mydomain.com
WILDCARD_HOST=*.sandstorm.mydomain.com
UPDATE_CHANNEL=dev
ALLOW_DEV_ACCOUNTS=false

[Jake W]

So I am gathering you can reach Sandstorm's setup and access the admin panel using the admin token URL, but you are not able to create the first/admin account.

Did you by chance select the "Disallow collaboration with users outside the organization" option? That one tends to be the problematic one to try to work around.

[R]

Correct on everything up front, But I have not enabled the Disallow Collab feature. 

When performing setup, I had used email auth initially, and set a domain for user verification of "Mydomain2.com"

Once I finished setting up, I got to the user creation and I get "rootUrl is not valid" and no other logs or output to help troubleshoot unfortunately and the only reference in other help forums I see to this issue are for a bug fixed in 2016 that doesn't seem to match my situation 

I also added GitHub oAuth, and that seems to take me back to the beginning of the sandstorm setup process when I finish it

I've also gone back and removed the organization verification and I get the same error

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[Jake W]

Hmmm, I think the only place that error exists in the code is here: https://github.com/sandstorm-io/sandstorm/blob/a2094c70eb0babbbf9736cde5b15dcba18270025/shell/imports/server/accounts/email-token/token-server.js#L236

And it looks like it's trying to validate your BASE_URL there to create the admin token with it there. Is it safe to assume you have your BASE_URL set the exact way your browser sees the server through the reverse proxy?