Unable to use voucher newly created on XG 210 rev.3

Hi all,

Please someone can help me,we have only one firewall Sophos with details:

Sophos XG210 rev.3
SFOS 18.0.4 MR-4

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Hotspot Settings:

Hotspot type: Voucher
Voucher definitions:
3 month ,10 GB
1 month, 3 GB
Devices per voucher: 1

Problem is:
If you try to log in with an unused voucher newly created (for 1 or 3 month), the following error message appears: "Maximum number of allowed devices per voucher limit has exceeded".

Note: Old vouchers created are working fine

Tested multiple times with new voucher.