Slack: Buttons do not work in "Do you want to show a rich preview?" message

[sbleon]

When I post a GH URL in a subscribed channel, the message above pops up. However, neither of the buttons works. When I click either button, they both flash briefly, as if being momentarily disabled. If I'm using Slack in my browser, I can see the following in the console:

Oct-2 13:41:11.606 [API-Q] (T03MW33L4) afd3ad0f-1570038071.605 chat.attachmentAction is ENQUEUED gantry-shared.59dd12e.min.js?cacheKey=gantry-1570034160:1
Oct-2 13:41:11.608 [API-Q] (T03MW33L4) afd3ad0f-1570038071.605 chat.attachmentAction is ACTIVE gantry-shared.59dd12e.min.js?cacheKey=gantry-1570034160:1
Oct-2 13:41:11.746 [API-Q] (T03MW33L4) afd3ad0f-1570038071.605 chat.attachmentAction is REJECTED: API not ok user_not_visible backend.js:6 

I've seen a recommendation to use /github signin to integrate my Slack profile with Github, but that doesn't work either. Slackbot responds with: /github failed with the error "user_not_visible"

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[stuartsierra]

I have observed the same issue when using the Slack app.

Slack Version 4.1.0 (Production)
macOS Mojave Version 10.14.5

[rossisdead]

I'm having a slightly different issue related to this prompt. I can hit "Dismiss" and the prompt disappears, but the next time I post a Github url it will prompt me again.

[ElijahLynn]

I have same issue in a private repo and get that same error /github failed with the error "user_not_visible". Don't understand what is going on.

https://github.com/integrations/slack#link-previews

[ElijahLynn]

Related > https://github.com/integrations/slack/issues/954

[ElijahLynn]

This appears to be because we may be restricted Slack single or multi-channel guests accounts), which I am. Can you all confirm your account types?

"user_not_visible" : "The calling user is restricted from seeing the requested user.",

https://github.com/slackhq/slack-api-docs/blob/ba81cad6bdd46a656a7b5725b49a64cf32730316/methods/im.open.json#L14

[sbleon]

I believe mine is a multi-channel guest account.

On Thu, Apr 2, 2020 at 1:50 PM Elijah Lynn [e-mail] wrote:

This appears to be because we may be restricted Slack single or
multi-channel guests accounts), which I am. Can you all confirm your
account types?

https://github.com/slackhq/slack-api-docs/blob/ba81cad6bdd46a656a7b5725b49a64cf32730316/methods/im.open.json#L14

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[stuartsierra]

Yes, I observed this in Slack accounts where I was a multi-channel guest.