Step 1: Configure Azure AD
Benchling is listed in the Azure application store - you'll need to create an instance of the Benchling app for each of your Benchling tenants - e.g. one for YOURDOMAIN.benchling.com, another for YOURDOMAINTEST.benchling.com, etc.
Follow the Azure instructions to get set up: https://docs.microsoft.com/en-us/azure/active-directory/saas-apps/benchling-tutorial - the only part that should be different is in the user attributes section (number 7): there, please create User Claims with firstName and lastName - not FirstName and LastName (note the case sensitivity).
Follow the testing procedures listed in the Azure instructions, then go to step 2.
Step 2: Continue following previous document
Return to SAML Single Sign-On and continue from Step 2.