diff --git a/cli/src/commands/setup/register.ts b/cli/src/commands/setup/register.ts
index 1e2a9fc0f4e..0fdd38d4c6d 100644
--- a/cli/src/commands/setup/register.ts
+++ b/cli/src/commands/setup/register.ts
@@ -1,4 +1,8 @@
+import { Repo } from '../../lib/repo.js'
+import { service } from '@bluesky-demo/common'
+import * as ucan from 'ucans'
 import cmd from '../../lib/command.js'
+import { REPO_PATH } from '../../lib/env.js'
 
 export default cmd({
   name: 'register',
@@ -7,6 +11,20 @@ export default cmd({
   args: [],
   opts: [],
   async command (args) {
-    throw new Error('TODO')
+    const repo = await Repo.load(REPO_PATH)
+    console.log('Registering with server...')
+    try {
+      // TODO - service needs to use `server`
+      const userStore = await repo.getLocalUserStore()
+      const blueskyDid = await service.getServerDid()
+      const token = await ucan.build({
+        audience: blueskyDid,
+        issuer: repo.keypair
+      })
+      await service.register(await userStore.getCarFile(), ucan.encode(token))
+    } catch (e: any) {
+      console.error(`Failed to register with server`)
+      console.error(e.toString())
+    }
   }
 })
\ No newline at end of file