both plugins seem to use the following url for configuring webhooks at repository level
[our_server]/plugins/servlet/webhooks/repository/[project_space]/[repo_name]/settings
Initially post-webhooks plugin was installed and above url worked for it. installing office365 plugin and both show in repository settings. however both have same link and show post-webhooks settings. Disabling post-webhooks allows url to direct to office365 config screen but then re-enabling post-webhooks results in url continuing to point to office365 page. Disabling office365 plugin for one. This plugin should use a less generic servlet name other than "webhooks".
relevant app keys are:
nl.topicus.bitbucket.bitbucket-webhooks
microsoft.office365.bitbucket.office-365-connector