Trouble unlocking Riven mod

[chibichaos]

Pistol Riven Mod- sustain a 3x melee combo multiplier for 30s with an active pet present.

i completed this task four times. Held combo for more than 2 minutes And it will not unlock. 

1- kubrow equipped. Riven Mod equipped dual cestras. Using fang prime with mods that extend combo durations. Held for 2 minutes at 3x combo show on screen. Survival v prime Venus

2 - kubrow equipped. Riven Mod equipped dual cestras. Using fang prime with damage mods removed just extended combo duration equipped. Held for 2 minutes. Combo multiplier shown on screen. Survival v prime Venus

3 kavat equipped. Riven Mod equipped dual cestras. Using fang prime only combo duration mods equipped. Held for 3 minutes. 3x combo multiplier show on screen. Survival apollodorus mercury. 

4- carrier prime. (Cause why the hell not nothing else was working.) riven mod equipped dual cestras. Using fang prime with only combo durations mods. Held for 2 minutes. 3x multiplier shown on screen. Survival apollodrous mercury. 

I’m getting frustrated because i know i’m holding the 3x mutilipier for more than 30s and now i’ve done it more than once. It has to be glitched. I tried all active “pets” and the mod is equipped. This all occurred on the pc platform