Our team had been experiencing this issue A LOT recently. And after trying a lot of suggestion from forums dating years ago with no luck.
I think I have found something that works, it's relating to the country you set on your sandbox account.
You just need to set the sandbox account's region to UNITED STATUS.
This could probably be because Apple is updating the prices of products for each country based on the current currency rates. And it could be that it takes time to update their Sandbox Environment thus mysterious "This item is currently being modified. Please try again later" error. If you set it to U.S. which is their default pricing currency then it would probably skip the currency rate check and let proceed.
Hope this helps!
reyjenald
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Our team had been experiencing this issue A LOT recently. And after trying a lot of suggestion from forums dating years ago with no luck.
I think I have found something that works, it's relating to the country you set on your sandbox account.
You just need to set the sandbox account's region to UNITED STATUS.
This could probably be because Apple is updating the prices of products for each country based on the current currency rates. And it could be that it takes time to update their Sandbox Environment thus mysterious "This item is currently being modified. Please try again later" error. If you set it to U.S. which is their default pricing currency then it would probably skip the currency rate check and let proceed.
Hope this helps!