# Digital onboarding - Error occurred adding product

**URL:** <https://developer.community.nhs.uk/t/digital-onboarding-error-occurred-adding-product/9897>\
**Category:** Digital Onboarding Service (DOS)\
**Tags:** onboarding\
**Created:** [7 January 2026 14:19 UTC](https://developer.community.nhs.uk/t/digital-onboarding-error-occurred-adding-product/9897 "2026-01-07T14:19:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Matt\_Wade](https://avatars.discourse-cdn.com/v4/letter/m/77aa72/32.png) [@Matt\_Wade](https://developer.community.nhs.uk/u/Matt_Wade)\
**Post date:** [7 January 2026 14:19 UTC](https://developer.community.nhs.uk/t/digital-onboarding-error-occurred-adding-product/9897/1 "2026-01-07T14:19:59Z")

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Similar to this topic: [Digital Onboarding - Add Product - Sorry Error Occurred](https://developer.community.nhs.uk/t/digital-onboarding-add-product-sorry-error-occurred/9365)

I am receiving this error trying to add “NHS Login API” product to our registration. We already have a legacy incomplete registration which may be causing this issue which is now labelled “NHS Login-LEG”.

I’m assuming this reference relates to “legacy” hence the attempt to begin a new registration for NHS Login API.

Can someone provide advice on the best course to progress this please.

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**Author:** ![Zeeshan\_Saeed](https://avatars.discourse-cdn.com/v4/letter/z/c5a1d2/32.png) [@Zeeshan\_Saeed](https://developer.community.nhs.uk/u/Zeeshan_Saeed)\
**Post date:** [7 January 2026 20:21 UTC](https://developer.community.nhs.uk/t/digital-onboarding-error-occurred-adding-product/9897/2 "2026-01-07T20:21:37Z")

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Hi Matt,

Thank you for posting your question - I can assist.

The Digital Onboarding Service has moved to a single assessment flow as of 19th November 2025. The API of “NHS Login-LEG” indeed refers to a legacy API (legacy = the old flow type).

As the product contains a legacy, former flow API, you cannot add the new single assessment instance of the API to that same product. For that reason, you will need to create a new product (with a new product name) and add “NHS login API” to this newly created product to start your assurance.

I hope this helps.

Please do not hesitate to reach out to me with any questions.

Thank you

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**Author:** ![Matt\_Wade](https://avatars.discourse-cdn.com/v4/letter/m/77aa72/32.png) [@Matt\_Wade](https://developer.community.nhs.uk/u/Matt_Wade)\
**Post date:** [8 January 2026 07:52 UTC](https://developer.community.nhs.uk/t/digital-onboarding-error-occurred-adding-product/9897/3 "2026-01-08T07:52:42Z")

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Sorted, thanks Zeeshan.

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**Author:** ![Zeeshan\_Saeed](https://avatars.discourse-cdn.com/v4/letter/z/c5a1d2/32.png) [@Zeeshan\_Saeed](https://developer.community.nhs.uk/u/Zeeshan_Saeed)\
**Post date:** [8 January 2026 09:16 UTC](https://developer.community.nhs.uk/t/digital-onboarding-error-occurred-adding-product/9897/4 "2026-01-08T09:16:36Z")

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Thanks Matt, great to hear. Please let me know if you have any more questions. 🙂