# Internal Fireblocks error: Deposit BTC in Sandbox from Exchange with

**URL:** <https://community.fireblocks.com/t/internal-fireblocks-error-deposit-btc-in-sandbox-from-exchange-with/962>\
**Category:** Developer Discussion\
**Created:** [April 26, 2024, 12:24pm UTC](https://community.fireblocks.com/t/internal-fireblocks-error-deposit-btc-in-sandbox-from-exchange-with/962 "2024-04-26T12:24:41Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![kabut](https://sea1.discourse-cdn.com/flex015/user_avatar/community.fireblocks.com/kabut/32/241_2.png) [@kabut](https://community.fireblocks.com/u/kabut)\
**Post date:** [April 26, 2024, 12:24pm UTC](https://community.fireblocks.com/t/internal-fireblocks-error-deposit-btc-in-sandbox-from-exchange-with/962/1 "2024-04-26T12:24:41Z")

</div>

I tried to deposit BTC from Exchange, BitMEX which I connected to my Fireblocks sandbox environment. And the I got the error as attached.

The transaction ID is: `b4c31034-98f6-4659-aa70-f4e48f099df5`

Could I have any helps on this isssue?

 ![スクリーンショット 2024-04-26 21.19.42](https://us1.discourse-cdn.com/flex015/uploads/fireblocks/original/1X/e59ea99e4f6a2d90decaefcb8e1ba9e0a1573f6e.png)

---

<div class="post-metadata">

**Author:** ![Wilfred](https://sea1.discourse-cdn.com/flex015/user_avatar/community.fireblocks.com/wilfred/32/403_2.png) [@Wilfred](https://community.fireblocks.com/u/Wilfred)\
**Post date:** [April 29, 2024, 7:27am UTC](https://community.fireblocks.com/t/internal-fireblocks-error-deposit-btc-in-sandbox-from-exchange-with/962/2 "2024-04-29T07:27:29Z")

</div>

Hi @kabut can you remove and re-add the exchange connection and initiate the transfer again via the web console?

---

<div class="post-metadata">

**Author:** ![kabut](https://sea1.discourse-cdn.com/flex015/user_avatar/community.fireblocks.com/kabut/32/241_2.png) [@kabut](https://community.fireblocks.com/u/kabut)\
**Post date:** [April 29, 2024, 8:29am UTC](https://community.fireblocks.com/t/internal-fireblocks-error-deposit-btc-in-sandbox-from-exchange-with/962/3 "2024-04-29T08:29:58Z")

</div>

@Wilfred Thanks for your support . I encountered another error after reconnections. I can see the amount so seems not credential issue…

TX Id:  
c68efd1e-ddd7-4bfa-a64f-090c7a237f41

Error message:  
Missing BitMEX Testnet credentials

The credentials for BitMEX Testnet are missing.

What can I do?

- Delete BitMEX Testnet account from your Fireblocks workspace and then reconnect it. You may need to update the TAP and generate a new API & secret key.
- Resubmit the transaction after reconnecting the account. Request help from the Developer Community if the problem persists.