docs: Add Jira/Server TS steps (#4250)

* docs: Add Jira Custom Field TS step

* docs: Add Jira/Server TS Steps

* Apply suggestions from code review

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

Author: t-h-man

src/docs/product/integrations/project-mgmt/jira/index.mdx

@@ -172,3 +172,13 @@ If you're having trouble setting up Self-Hosted Sentry, verify the following:
 ![](jira-something-went-wrong.png)
 
 This issue typically occurs if you have an ad blocker blocking the conversation between JIRA and Sentry during setup. To remediate the issue, disable your ad blocker and go through the installation flow again.
+
+### Can't Create Issues Using a Custom Required Field
+
+We don’t support custom required fields for the Jira integration. The only required fields we support are the ones that are pre-populated by us. If possible, you can edit your required fields in Jira, or as a workaround, you can create a ticket in Jira first and then link it in Sentry.
+
+### Receiving a 4xx/5xx Error for the Jira Server Integration
+
+A `400` error is often generated because the Jira instance is not publicly accessible. Make sure your instance is routable (that is, our server can reach it!). If not, you’ll need to put your Jira instance on the internet so that we can reach it.
+
+For a `500` error, unfortunately the reason can vary. This error means we couldn’t connect to your server from our server. For example, perhaps your proxy is not configured correctly, or not set to allow our IP. If you need to allow our IPs, you can find a list of our IP ranges [here](/product/security/ip-ranges/).