[WIP] When we cannot reach a provider, show an error that Provider unreachable

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

Right now when we try to fetch tokens we just say "Error fetching, check credentials". If the provider unreachable due to an outage, let's rather show that the provider isnt reachable, instead of the generic credentials error.

Fixes #3381.

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[six7]

try again