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Harrel BramleyHarrel Bramley 

My mobile app will not let me log into my trailhead playground. I can log into salesforce & trailheads, but not my p-ground. Any suggestions? I tried various url's. I even used the one i connect with on my computer, success on the computer, not mobile.

SandhyaSandhya (Salesforce Developers) 
Hi,

Refer below link and get your username and passowrd for trailhead playground.

https://force.desk.com/customer/portal/articles/2659738-how-to-get-a-password-for-my-trailhead-playground?b_id=13478
 
When you 'Launch' the trailhead playground from trailhead you will see something like below url.

https://resourceful-raccoon-181749-dev-ed.lightning.force.com/one/one.app#/sObject/Dashboard/home

Copy  https://resourceful-raccoon-181749-dev-ed.lightning.force.com from the above url and use as custom org in your mobile by providing the trailhead playground credentails.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
 
Best Regards
Sandhya
 
Harrel BramleyHarrel Bramley
I used my trailhead: curious-bear-109993-dev-ed.lightning.force.com I use the same credentials that I successfully log in with on my computer. It fails on mobile.
Bhuvanesh MohankumarBhuvanesh Mohankumar
What is the error message you got when It fails on mobile?
Harrel BramleyHarrel Bramley
The error message I receive is as follows: Any assistance is greatly appreciated. Regards, Harrel Bramley SME / Senior Delivery Consultant Sparta Systems m.732.261.8661 harrelb@spartasystems.com| www.spartasystems.com [cid:image001.png@01D348C9.6BC18F70]
PRASHANT Joshi 18PRASHANT Joshi 18
This is an old thread but I am still writing an answer to help anyone who may google it. I struggled for 2 hours for this and then I realized I was doing a silly mistake. My salesforce login is xxxxxx@gmail.com  whereas my trailhead user is xxxxxx@brave-raccoon-fczbbu.com. 
So, you launch the playground from trailhead and then go to Setup -> users. Carefully notice the exact user name, that is what you have to give in the Saleforce Mobile App. 
John-James McChesney 13John-James McChesney 13
I can't log into mobile app using my trailhead playground credentials!!! So frustrating!!! 

1. In trailhead playground get username, then reset password.

2. In mobile app use custom domain (XXXXs replaced with actual values and did not enter https://)

https://XXXX-XXXX-XXXXX-dev-ed.lightning.force.com/

( also tried https://XXXX-XXXX-XXXXX-dev-ed.my.salesforce.com/)

3. Then enter playground username and password..

Result: Get 'contact admin' error message.

Tried above with connection set to Production and Sandbox.

Any help would be greatly appreciated.

p.s. anyone know of good salesforce mobile simulator 
Wendy M GriffinWendy M Griffin
Hello John-James....were you finally able to login to your trailhead playground on mobile? If so, how did you do it? I have reset my password numerous times and always get the 'contact admin' error message. Hoping you may have found the solution. Thanks!
Erin WilsonErin Wilson
I'm having the same exact issue John-James and Wendy. Any luck?
Nicholas Moore 1Nicholas Moore 1
Ok - I finally was able to log in.  I noticed under the custom domain screen, it was auto generating the https at the beginning.  So when I pasted in https://XXXX-XXXX-XXXXX-dev-ed.lightning.force.com/, it was actually reading https://https://XXXX-XXXX-XXXXX-dev-ed.lightning.force.com/