This thread is resolved. Here is a description of the problem and solution.
Problem: Not being able to access the sop page. Error 502 is displayed. Solution: Woocommerce Multilingual bug in 4.6.1 may affect some installations. Updating to version 22.214.171.124 and onwards solves the issue. Relevant Documentation: https://wpml.org/errata/timeouts-with-woocommerce-multilingual-4-6-1/
This is the technical support forum for WPML - the multilingual WordPress plugin.