500 Error when trying to unlink ACH Bank account

I’m getting a 500 error when I try to unlink a bank account. I have a full log but the condensed version is (account information replaced with ‘…’)

instrument.ts:157 DELETE https://app.alpaca.markets/internal/accounts/.../relationships/... 500
instrument.ts:129 api#error DELETE /accounts/.../relationships/... 
                  {} 500 
                  {code: 50010000, message: "internal server error occurred"}
                     code: 50010000
                     message: "internal server error occurred"
                     __proto__: Object
banking:1 Uncaught (in promise) 
          e {name: "ApiException", method: "DELETE", path: "/accounts/.../relationships/...", 
          params: {…}, status: 500, …}
             code: 50010000
             message: "internal server error occurred"
             method: "DELETE"
             name: "ApiException"
             params: {}
             path: "/accounts/.../relationships/..."
             status: 500
             __proto__: Object

I have tried with Chrome (89.0.4389.90), Edge (89.0.774.68), and Safari (14.4.2) all with the same result. I note that the 50010000 error is the same as in this topic and may be related if that code is not generic – although that issue was indicated as fixed on March 18.

Traceback from click handling on:

(anonymous)          @ instrument.ts:129
(anonymous)          @ rest.js:174
Promise.then (async)
(anonymous)          @ rest.js:172
Promise.catch (async)
(anonymous)          @ rest.js:164
s                    @ runtime.js:45
(anonymous)          @ runtime.js:274
forEach.e.<computed> @ runtime.js:97
r                    @ asyncToGenerator.js:3
c                    @ asyncToGenerator.js:25
Promise.then (async)
r                    @ asyncToGenerator.js:13
c                    @ asyncToGenerator.js:25
(anonymous)          @ asyncToGenerator.js:32
(anonymous)          @ asyncToGenerator.js:21
(anonymous)          @ rest.js:49
s                    @ runtime.js:45
(anonymous)          @ runtime.js:274
forEach.e.<computed> @ runtime.js:97
r                    @ asyncToGenerator.js:3
c                    @ asyncToGenerator.js:25
Promise.then (async)
r                    @ asyncToGenerator.js:13
c                    @ asyncToGenerator.js:25
(anonymous)          @ asyncToGenerator.js:32
(anonymous)          @ asyncToGenerator.js:21
(anonymous)          @ rest.js:33
(anonymous)          @ index.js:8
(anonymous)          @ middleware.js:22
(anonymous)          @ store.js:13
dispatch             @ redux.js:638
(anonymous)          @ account.js:648
(anonymous)          @ index.js:8
(anonymous)          @ middleware.js:22
(anonymous)          @ store.js:13
e.handleUnlink       @ BankingCard.js:98
t.handleClick        @ button.js:136