Can't send group SMS supported by network

[Dphilip]

Since i updated my sony Xperia Z2 to marshmallows
I can't send group SMS through a special app ( go sms pro) adding that i opened all permission i know for the app
and it was working normally with lollipop software
Please need help as this issue affects my work.

[Uliwooly]

@Dphilip

That's a third party app, contact the app developer regarding this issue. 

[Dphilip]

Hello dears

This Issue related to new software as it block the app to send messages to group sms

I have a sevice from my service provider let me send number on network on groups then send sms to the group number such as 1,2,3, ect...

So please need your advice and help

Thank you in advance

[Uliwooly]

@Dphilip

Contact the app developer regarding this issue as it's up to them to correct it.