Start session (dev mode and widgets page) is not working

Description

Start session on the conversations page (only dev mode) and on the widgets page is not loading.

Part of the tests related to that are disabled for now.

CAAS - Bug default text according to the team DoR (Definition of Ready)

01 - PERSON OF CONTACT (PERSON THAT CAN ANSWER QUESTIONS ABOUT THE PROBLEM):
02 - PROBLEM (GIVE MORE DETAILS HERE ABOUT SCENARIO OR PAIN TO BE RESOLVED?):
03 - ORGANIZATION / TENANT ACCESS URL (REQUIRED ONLY FOR CAROL):
04 - VERSION (2C OR CAROL):
05 - PRODUCT (WHAT IS THE PRODUCT?):
06 - DATABASE (REQUIRED ONLY FOR 2C - WHAT IS THE CUSTOMER DATABASE?):
07 - FORWARDED INVITATIONS (ENVIRONMENT ADMINS):
08 - APP VERSION:
09 - OBSERVATIONS:
10 - WHAT ADDITIONAL INFORMATION COULD YOU PROVIDE?
11 - STEPS TO REPRODUCE (STEPS 1 TO N INCLUDING SCREENSHOTS, LOGS FOLDER, HEARTBEAT, ETC):
12 - EXPECTED BEHAVIOR (WHAT SHOULD BE THE DEFAULT BEHAVIOR LINKED WITH THE STEPS ABOVE):