Barcodes not showing barcode.tec-it.com

We have barcodes generated from order numbers but the keep not showing today.

We’ve been using these for years and they’ve been working sometimes today.

https://barcode.tec-it.com/barcode.ashx?data=”&[Order Number]&"/SAMP”

They are showing the grey triangle, so I don’t think it’s because of too many requests as that usually shows a different message from tec-it I think.

Has anyone else been having the same issue?