Azure AD PIM directory roles audit history support for 1 year
For customers that have purchased the Microsoft Office 365 E5 license for there users and new logging feature exist that extends standard logging in Azure AD for 1 year. The feature is known as "Long-term Office 365 audit log private preview" and is mentioned in this article: https://docs.microsoft.com/en-us/office365/securitycompliance/search-the-audit-log-in-security-and-compliance
Please allow "Directory roles audit history" to search back in time for at least a year, if customers have the proper logs available in there Azure AD tenants.
Workaround: As a work around for now. I'm using Azure Log Analytics for storing role changes for long-term history. Customers would like to see the logs available for the standard tools within the Azure AD portal like PIM Directory Roles audit, Azure AD Audit, Sign-In Activity, etc.