Signups sometimes don't work.

[DFurnes]

BUG

Current Behavior

Sometimes Phoenix Next is receiving a "false" failure response when trying to create a signup:

[false]

Desired Behavior

We should handle errors more gracefully.

Steps to Replicate

We can't! Oy.

Why This Matters

Users need to be able to sign up for a campaign!

Countries Affected (optional)

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OS/Browser (optional)

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Relevant Screenshots + Links

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[DFurnes]

There are a couple branches where the signup endpoint could return false...