Onesignal is returning "all included players are not subscribed"

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Android

errors

webservice

I am calling onesignal from my soap webservice and everything was working fine until yesterday. Suddenly and without making any changes , this service is returning

"{"id":"","recipients":0,"errors":["All included players are not subscribed"]}" false

as response. Below is my posted json:

postString = "{""app_id"":""my_api"", ""tags"" : [{""key"": ""my_key"",
""relation"": ""="", ""value"": """ & my_key& """}] ,""data"" : {""contactName""
: """ & contactName & """ , ""phoneNumber"" : """ & phoneNumber & """,""latitude""
: """ & latitude & """, ""longitude"" : """ & longitude & """, ""messageType"" :
""" & messageType & """,""MessageDate"" : """ & MessageDate & """ }, ""contents""
: {""en"" : """ & pushMessage & """ } }"

What I have tried:

After making some searches I realized that parameter names are case sensitive, but in my case I didn't change anything. I tried to add ""included_segments"" : [""All""] but still have the same error.Any hints?