Shopware Store exception when requesting available plugin updates - Error 401 - Shopware 6.3.5.2

I cannto check for plugin updates in System → Settings → Plugins. In StoreClient->getUpdatesList the following error is returned from api.shopware.com:

string(339) "Client error: POST https://api.shopware.com/swplatform/pluginupdates?shopwareVersion=6.3.5.2&language=en-GB&domain=www.miche-bag.eu&hostName=www.miche-bag.eu resulted in a 401 Unauthorized response:
{„success“:false,„code“:„ShopwarePlatformException-1“,„title“:„Unauthorized“,„description“:"The taken action is unauthor (truncated…)
"
string(4164) „#0 …/vendor/guzzlehttp/guzzle/src/Middleware.php(65): GuzzleHttp\Exception\RequestException::create(Object(GuzzleHttp\Psr7\Request), Object(GuzzleHttp\Psr7\Response))
#1 …/vendor/guzzlehttp/promises/src/Promise.php(204): GuzzleHttp\Middleware::GuzzleHttp{closure}(Object(GuzzleHttp\Psr7\Response))
#2 …/vendor/guzzlehttp/promises/src/Promise.php(153): GuzzleHttp\Promise\Promise::callHandler(1, Object(GuzzleHttp\Psr7\Response), NULL)
#3 …/vendor/guzzlehttp/promises/src/TaskQueue.php(48): GuzzleHttp\Promise\Promise::GuzzleHttp\Promise{closure}()
#4 …/vendor/guzzlehttp/promises/src/Promise.php(248): GuzzleHttp\Promise\TaskQueue->run(true)
#5 …/vendor/guzzlehttp/promises/src/Promise.php(224): GuzzleHttp\Promise\Promise->invokeWaitFn()
#6 …/vendor/guzzlehttp/promises/src/Promise.php(269): GuzzleHttp\Promise\Promise->waitIfPending()
#7 …/vendor/guzzlehttp/promises/src/Promise.php(226): GuzzleHttp\Promise\Promise->invokeWaitList()
#8 …/vendor/guzzlehttp/promises/src/Promise.php(62): GuzzleHttp\Promise\Promise->waitIfPending()
#9 …/vendor/guzzlehttp/guzzle/src/Client.php(183): GuzzleHttp\Promise\Promise->wait()
#10 …/vendor/guzzlehttp/guzzle/src/Client.php(96): GuzzleHttp\Client->request(‚post‘, ‚/swplatform/plu…‘, Array)
#11 …/vendor/shopware/core/Framework/Store/Services/StoreClient.php(208): GuzzleHttp\Client->__call(‚post‘, Array)
#12 …/vendor/shopware/core/Framework/Store/Api/StoreController.php(209): Shopware\Core\Framework\Store\Services\StoreClient->getUpdatesList(‚0642efaf90d6284…‘, Object(Shopware\Core\Framework\Plugin\PluginCollection), ‚en-GB‘, ‚www.miche-bag.e…‘, Object(Shopware\Core\Framework\Context))
#13 …/vendor/symfony/http-kernel/HttpKernel.php(158): Shopware\Core\Framework\Store\Api\StoreController->getUpdateList(Object(Symfony\Component\HttpFoundation\Request), Object(Shopware\Core\Framework\Context))
#14 …/vendor/symfony/http-kernel/HttpKernel.php(80): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#15 …/vendor/symfony/http-kernel/Kernel.php(201): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#16 …/vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(85): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#17 …/vendor/symfony/http-kernel/HttpCache/HttpCache.php(477): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle(Object(Shopware\Production\Kernel), Object(Symfony\Component\HttpFoundation\Request), 1, true)
#18 …/vendor/symfony/http-kernel/HttpCache/HttpCache.php(450): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true)
#19 …/vendor/symfony/http-kernel/HttpCache/HttpCache.php(344): Symfony\Component\HttpKernel\HttpCache\HttpCache->fetch(Object(Symfony\Component\HttpFoundation\Request), true)
#20 …/vendor/symfony/http-kernel/HttpCache/HttpCache.php(222): Symfony\Component\HttpKernel\HttpCache\HttpCache->lookup(Object(Symfony\Component\HttpFoundation\Request), true)
#21 …/vendor/shopware/core/HttpKernel.php(163): Symfony\Component\HttpKernel\HttpCache\HttpCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 …/vendor/shopware/core/HttpKernel.php(80): Shopware\Core\HttpKernel->doHandle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#23 …/public/index.php(82): Shopware\Core\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#24 {main}“

The solution was. Shopware admin → System → Settings → Plugins. Logout and Re-Login into your shopware account from there (even if credentials have not changed, eventuall clear browser cache before re-login). Just a stupid behaviour of showare