To connect Marker.io with Jira, you need your email but it's not always easy to find it.
Open your company's Jira
Navigate to your Profile
Under the Jira Profile section your can find your Email
Here's a screenshot to help you find it:

To connect Marker.io with Jira, you need your email but it's not always easy to find it.
Open your company's Jira
Navigate to your Profile
Under the Jira Profile section your can find your Email
Here's a screenshot to help you find it: