[SalesForce] Conga Composer does not open from Lightning Experience button

I have a Detail Page Button on the Opportunity object that opens a url for conga composer. this is the button's code:

https://composer.congamerge.com
?sessionId={!API.Session_ID}
&serverUrl={!API.Partner_Server_URL_290}
&Id={!Opportunity.Id}
&Culture=he-IL
&ReportId=00O80000003XawR

On classic Salesforce this button opens a new window with conga and all is well.
When I move my UI to lightning experience, this button does not work – I get this error:

Invalid session or the session has expired. (Lock IPs may be enabled.)

enter image description here

I have searched for this error message and came to a few web pages (Conga web site, Salesforce) that explain to do :

  1. Ensure "Lock sessions to the IP address from which they originated" is NOT enabled
  2. Ensure the user running the solution has "API Enabled" on their Profile
  3. Ensure you have not reached your maximum API request limit
  4. Check to see if your Salesforce server is down

Now all of these settings are ok in my user and profile and org, also – in classic it works perfect.

I have also checked the URL that is generated from the button – it is the same from classic and LEX UI:

https://composer.congamerge.com/composer8/index.html?
sessionId=mysamesessionid&
serverUrl=https%3A%2F%2Fna28.salesforce.com%2Fservices%2FSoap%2Fu%2F29.0%2F&
Id=0061A0000139JpE&
Culture=he-IL&
ReportId=00O80000003XawR

Why doesn't the conga button work from LEX?

Best Answer

Conga's support site indicates that the session id button doesn't work in lightning, and that the oauth form must be configured and used. composer button help

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