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Connecting a Zapier account fails

Description

Original report: https://forum.mattermost.org/t/error-connecting-to-zapier/6410

Reproduced by JIRA reporter as well.

Steps to reproduce:
1. From the Mattermost System Console enable incoming webhooks, outgoing webhooks, custom slash commands, OAuth 2.0 service provider,
2. Then from the Integrations menu for my team, create a new OAuth 2.0 application for Zapier, following the directions at https://docs.mattermost.com/integrations/zapier.html#register-zapier-as-an-oauth-2-0-application, using callback URL https://zapier.com/dashboard/auth/oauth/return/MattermostDevAPI/
3. Next, at Zapier, create a new connected account for Mattermost, providing my Mattermost server URL with no trailing slash, the client ID and client secret copied from the Mattermost integration.
4. Click “Yes, continue,”

Observed: Error message from my mattermost server: “invalid_request: Supplied redirect_uri did not match registered callback_url”

Expected: Successful registration of the connected account.

QA Test Steps

None

Status

Mana

None

Assignee

Joram Wilander

Reporter

Jason Blais

Epic Link

None

Fix versions

Mattermost Team

ABC

Sprint

None

Labels

None

GitHub Issue

None

QA Assignee

Dylan Haussermann