When I try to install I get the following composer error:
- wildbit/postmark-php[2.5.0, ..., 2.11.0] require guzzlehttp/guzzle ~6.0 -> found guzzlehttp/guzzle[6.0.0, ..., 6.5.8] but the package is fixed to 7.5.0 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.
If possible, check compatibility with Guzzle 7 and update composer requirements (maybe just 6|7)
Closed: cannot reproduce
1.2
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I just installed the latest version in Drupal 10, without any problems ... Feel free to re-open the issue, if you still have this problem.