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Albert WongAlbert Wong 

Challenge not working - Post a Link to Your Chatter Feed

You're supposed to create a link post in chatter.  Did it but it doesn't work.  Other posts says others are having the same problem. 
Albert WongAlbert Wong
Here's a list of other people having same problem.   https://developer.salesforce.com/forums?id=906F0000000DCmvIAG
Chris DuarteChris Duarte
Challenge is working fine. Please switch to Classic to access the Link type post. We accept both http and https since people wanted to enter both types of links.

Here is where you choose the Link action.

Below it, see the chatter post with http.

User-added image
And here is https. Again, both http and https are accepted.
User-added image
Albert WongAlbert Wong
@Chris Your suggestion didn't work.  It doesn't pass the verificatin test so you can get trail completion. 

@All So I got a message from SDFC support.   They said that the instructions are incorrect.   I was able to complete the trail after following the below instructions. 
----

OpinionLab's Client Service Team
Subject: SF Trailhead 15min Alerts from [+]OL
JUN 28, 2017  |  03:17PM PDT 
Ravindra Babu replied:
Hi,
Thanks for reaching us. Sorry for the inconvenience. That URL content needs to be updated. Please replace the URL as ‘http://trailhead.salesforce.com’ instead of ‘https://trailhead.salesforce.com’ with the name Trailhead and enter the text ‘Trailhead is the fun way to learn Salesforce’ and then validate the challenge.
Please don’t hesitate to reach us if need any further assistance!
Best Regards,
Ravindra
Chris DuarteChris Duarte
@Albert thanks for your reply. Ravindra and I work on the same team. There was a previous bug in this challenge where only http was accepted, but that was resolved months ago.

Before I replied to you, I personally verified that both http and https work. As you can see in my post, both options are included - http and https - and both verify correctly. 
Joyce BealJoyce Beal
All,

I have tried all the various ways described above and it is still not working.  I looked for extra spaces at the end of the period still not working.  I tried both http and https.  I tried Trailhead with a period at the end and without the period at the end.
Joyce BealJoyce Beal
Sorry, just figured out my error.  
 
Thomas Pham 17Thomas Pham 17
I don't even have the Post Link option in the more section, can anyone help with this issue? 

post link screenshot
Thomas Pham 17Thomas Pham 17
Got it to work.  At least for MY ISSUE, the Link and Poll were removed from the global layout.  Used the following instructions to get those two back on there.  
https://developer.salesforce.com/docs/atlas.en-us.fundamentals.meta/fundamentals/adg_chatter_actions_global_layout_try.htm
User-added imageThen followed the helpful advice above to do this in classic rather than on the app or lightning.
Dave HudnuttDave Hudnutt

"Please switch to Classic to access the Link type post."

Appreciate this info that helped pass the challenge. Usually this information is included in the unit itself (https://trailhead.salesforce.com/content/learn/modules/lex_salesforce1_basics/lex_salesforce1_basics_collab?trail_id=lex_end_user) and for this one it is not. Is that intentional?