APM session attribute exists

You are using 'info exists' and 'mcget' incorrectly.

'mcget' will return the value of the APM session variable, so if the session variable for 'session.ad.last.attr.mobile' is 555-1234 you are passing this to 'info exists'. i.e. you are executing 'info exits 555-1234' but guessing no variable exists named 555-1234 (or what ever the value is)

I think if you call 'mcget' on a session variable that doesn't exist I think you get "" returned, so the following should do what you want (not tested as no quick access to APM currently):

if {[mcget {session.ad.last.attr.mobile}] == ""} {
    set ad_attribute1_exists 0
} else {
    set ad_attribute1_exists 1
}
if {[mcget {session.ad.last.attr.pager}] == ""} {
    set ad_attribute2_exists 0
} else {
    set ad_attribute2_exists 1
}
expr { $ad_attribute1_exists == 1 && $ad_attribute2_exists == 1}

Or as a one liner:

expr { [mcget {session.ad.last.attr.mobile}] != "" && [mcget {session.ad.last.attr.pager}] != ""}