Unable to download apps from play store thru mobile data

I can't download any apps thru my mobile data. It usually shows download pending.
Twice I had sentence that app is big and I may be charged for download but it was only 67mb. Couldn't start download anyway....
All apps downloading with no problem over wifi- I'm sure I have data allowance and phone is brand new- I have it 2 days. Moto G6

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