Customer is finding change log alerts are not received. What could be the reason?

Please check following things at first level –
a. Check whether Changelog is generated for specific parameter. This can be checked by going to menu Inventory-> Change Logs- > Change Logs Tab → Select specific System along with Type and specify time interval. Please refer Change Logs
b. Check whether alert is configured with needed input parameters. This can be checked by going to Settings-> Alarms Unification setting to check change log alarm unification rule is configured and notification is enabled. Please refer Alarm Unification
c. Check whether selected notification profile under alarm unification rule is configured with right roles and users Notification Profiles - Fault
d. Check whether SMTP or Exchange test is working. Please refer SapphireIMS User Manual 5.0
Please reach out to support if further help is needed.