You would like to add Symantec account to Splunk SOC View App. You set ICDm hostname to api.sep.eu.securitycloud.symantec as your tenant is hosted in EU. However when you revisit your account settings, the hostname reverts back to default US based hostname.
Splunk SOC View App
This is a misleading cosmetic issue just shown incorrectly in UI. Correct value is still saved in the configuration file at etc/apps/TA-symantec_soc_view/local/ta_symantec_soc_view_account.conf, ICDM_Account stanza(hostname_ip_icdm property).
Broadcom engineering is aware of this issue and is working to solve it.