Risky user signin observed in non-Microsoft network device

Original query, unchanged.

SigninLogs
//Find risky Signin
| where RiskState == "atRisk" and ResultType == 0
| extend Signin_Time = TimeGenerated
| summarize
    AppDisplayName=make_set(AppDisplayName),
    ClientAppUsed=make_set(ClientAppUsed),
    UserAgent=make_set(UserAgent),
    CorrelationId=make_set(CorrelationId),
    Signin_Time= min(Signin_Time),
    RiskEventTypes=make_set(RiskEventTypes)
    by
    ConditionalAccessStatus,
    IPAddress,
    IsRisky,
    ResourceDisplayName,
    RiskDetail,
    ResultType,
    RiskLevelAggregated,
    RiskLevelDuringSignIn,
    RiskState,
    UserPrincipalName=tostring(tolower(UserPrincipalName)),
    SourceSystem
| join kind=inner (
    CommonSecurityLog
    | where DeviceVendor has_any  ("Palo Alto Networks", "Fortinet", "Check Point", "Zscaler")
    | where DeviceProduct startswith "FortiGate" or DeviceProduct startswith  "PAN" or DeviceProduct startswith  "VPN" or DeviceProduct startswith "FireWall" or DeviceProduct startswith  "NSSWeblog" or DeviceProduct startswith "URL"
    | where DeviceAction != "Block"
    | where isnotempty(RequestURL)
    | where isnotempty(SourceUserName)
    | extend SourceUserName = tolower(SourceUserName)
    | summarize
        min(TimeGenerated),
        max(TimeGenerated),
        Activity=make_set(Activity)
        by DestinationHostName, DestinationIP, RequestURL, SourceUserName=tostring(tolower(SourceUserName)),DeviceVendor,DeviceProduct
    | extend 3p_observed_Time= min_TimeGenerated,Name = tostring(split(SourceUserName,"@")[0]),UPNSuffix =tostring(split(SourceUserName,"@")[1]))
    on $left.IPAddress == $right.DestinationIP and $left.UserPrincipalName == $right.SourceUserName
| extend Timediff = datetime_diff('day', 3p_observed_Time, Signin_Time)
| where Timediff <= 1 and Timediff >= 0